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Keep sfos on A slot.
Installing image There is no TWRP available so it's csdmplicated. I tried to build image manually but it had corrupted ext4 (for whatever reason). You can install stock on B slot and install sfos from stock (not tested).
- put .tar.bz2 file onto SDCARD - using fastboot format userdata - fastboot format:ext4 userdata - flash kernel - it will boot to ramdisk then: - mkdir /sdcard - mount /dev/mmcblk0p1 /sdcard - cp /sdcard/sfos.tar.bz2 /data/sailfishos-rootfs.tar.bz2 - Do as this script does (literally copy paste lines) updater-unpack.sh - after unpacking reboot and it should be fine